Question

A schoolteacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 7 pCi/L. The school samples the air for 16 days and finds an average concentration of 7.4 pCi/L with a standard deviation of 1 pCi/L. Calculate the value of the test statistic.

*a) t*_{15} = −1.60

*b) z* = −1.60

*c) t*_{15} = 1.60

*d) z* = 1.60

Answer #1

SOLUTION:

this is the RIGHT tailed test .

The null and alternative hypothesis is ,

H0 : = 7

Ha : >7

df=n-1=16-1=15

Test statistic = t

= ( - ) / s / n

= (7.4-7) / 1/ 16

= 1.6

t,df=t,15 =1.6

correct option *c) t*15 = 1.60

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 3 minutes ago

asked 18 minutes ago

asked 18 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago